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https://issues.apache.org/jira/browse/HDFS-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932685#action_12932685
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Jakob Homan commented on HDFS-1071:
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I'd like to get this one into 22, so I ran the tests myself. All tests passed
except also-failing-on-trunk TestDatanodeBlockScanner, TestBlockRecovery,
TestStorageRestore, TestDatanodeDeath.
{noformat} [exec] -1 overall.
[exec]
[exec] +1 @author. The patch does not contain any @author tags.
[exec]
[exec] +1 tests included. The patch appears to include 3 new or
modified tests.
[exec]
[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
[exec]
[exec] +1 findbugs. The patch does not introduce any new Findbugs
warnings.
[exec]
[exec] -1 release audit. The applied patch generated 98 release audit
warnings (more than the trunk's
current 1 warnings).
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[exec] +1 system test framework. The patch passed system test
framework compile.{noformat}
I'm going to commit this.
> savenamespace should write the fsimage to all configured fs.name.dir in
> parallel
> --------------------------------------------------------------------------------
>
> Key: HDFS-1071
> URL: https://issues.apache.org/jira/browse/HDFS-1071
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: Dmytro Molkov
> Attachments: HDFS-1071.2.patch, HDFS-1071.3.patch, HDFS-1071.4.patch,
> HDFS-1071.5.patch, HDFS-1071.6.patch, HDFS-1071.7.patch, HDFS-1071.patch
>
>
> If you have a large number of files in HDFS, the fsimage file is very big.
> When the namenode restarts, it writes a copy of the fsimage to all
> directories configured in fs.name.dir. This takes a long time, especially if
> there are many directories in fs.name.dir. Make the NN write the fsimage to
> all these directories in parallel.
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